One user on a social site may favorite, follow, or Digg something about you, and suddenly your brand and name is now being shown to all of their friends, and if they repost, they open your brand up to all of their friends, and so on, and, well, you et the picture.
Businesses can start with a company presence or profile on different, but appropriate, social media sites. You can create a Fanpage on Facebook, get your employees on LinkedIn, sign up for Twitter, or start submitting relevant articles and content to social bookmarking sites, like Digg and StumbleUpon. You can also use free blogs like Blogger to open a discussion between your business and potential customers.
When creating profiles on these sites, remember to link them up. For example, on your Twitter profile you can include a link to your blog or Web site. On Facebook you can install a Digg application so others can see what you favorite, and a Facebook Twitter application lets your Tweets become your Facebook status update. Twitter feeds can be added to your blog, and so on. By linking up your profiles, with one update you can blast your message to multiple social sites.